TELEFUNKEN Semiconductors
Parameters
Transmission
Transmit gain (note 1)
on MIC1 / MIC2
Test conditions
V
MIC
= 3 mV
rms
MIS
max. gain
0
min. gain
0
Min.
Typ.
U3810BM
Max.
Unit
Fig.
TX2
1
0
TX1
1
0
TX0
1
0
47.0
39.8
48.0
41.0
49.0
42.2
dB
dB
6
dB
dB
dB
6
V
MICX
= 5 mV
rms
MIS TX2 TX1 TX0
on MICX
43.0
44.0
45.0
max.gain
1
1
1
1
35.8
37.0
38.2
min. gain
1
0
0
0
Gain adjustment of micro-
Gain change between two steps (both on
phone amplifier
MIC1/MIC2 and on MICX)
0.8
1.0
1.2
Transmit gain without AGC V
MIC
= 3 mV
rms
, Bit AGC=1
G
T
at 28 mA
TX2 TX1 TX0
0
1
1
D
G
T
at I
L
= 20 to 28 mA
42.6
44.0
45.5
0
1
1
D
G
T
at I
L
= 28 to 60 mA
–0.5
0.0
0.5
0
1
1
–0.5
0.0
0.5
Gain change between
V
MIC
= 3mV
rms
:
AT1 AT0
28 and 60 mA
(MIS = 0)
0
0
3.6
4.1
4.6
on MIC1 / MIC2
0
1
4.9
5.35
5.9
on MICX
or V
MICX
= 5 mV
rms
6.3
6.9
7.4
1
0
7.7
8.2
8.7
(MIS = 1)
1
1
+6 dB delta transmit gain
I
L
= 28 mA and 60 mA
V
MIC
= 1.5 mV
rms
, Bit TX6 = 1
5.4
6.0
6.6
Noise at line
GT = max. gain
psophometrically weighted V
MIC
= 0 (MIS = 0) ISQ = 0
– 79
– 75
V
MIC
= 0 (MIS = 0) ISQ = 1
– 73
– 70
– 64
V
MICX
= 0 (MIS = 1) ISQ = 1
*Max. gain is without + 6 dB function which is especially devoted for DTMF
Muted gain
V
MIC
= 3 mV
rms
(MIS = 0) or
V
MIC
= 5 mV
rms
(MIS = 1)
(at max. and min. gain)
Bit IM = 1
65
on MIC1 / MIC2
Bit IT = 1
65
V
MIC
= 3 mV
rms
(MIS = 1) or
60
on MICX
V
MIC
= 5 mV
rms
(MIS = 0)
60
Microphone input
impedance
on MIC1/MIC 2
V
MIC
= 3 mV
rms
(MIS = 0)
70
110
on MICX
V
MICX
= 5 mV
rms
(MIS = 1)
35
55
CMRR common mode
G
T
= at maximum gain
65
rejection ratio
Voltage step on pin 26
I
L
=28 mA and 60 mA
when going from transmis- V
MIC
= 0 (MIS = 0) or
– 75
+75
sion to mute mode
V
MICX
= 0 (MIS = 1)
Bit IM from 0 to 1
At maximum gain
Dynamic limiter (anti-clipping) CACL = 470 nF, RACL = 6.8 M
W
operational only on MIC1/MIC2
Output voltage swing
TX2 TX1 TX0
(peak to peak value)
1
1
1
3.3
4.4
V
MIC
= 4 mV
rms
+ 10 dB
Delta output voltage swing
TX2 TX1 TX0
0
0
0
–200
0
200
V
MIC
= 9 mV
rms
+ 10 dB
Rev. A1: 19.01.1996
dB
6
dB
6
dB
6
6
dBmp
dB
dB
dB
dB
k
W
k
W
dB
6
6
6
mV
6
V
pp
6
mV
pp
6
11 (31)
TEMIC [ TEMIC SEMICONDUCTORS ]
